<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>
    function fun(a,b){
        console.log("这句话能看见吗");
        return a+b;
    }
    console.log(fun(1,2));
</script>
</body>
</html>